Override getShape() (check blocks like torch, button, doors...etc), and return different voxel shape according to the blockstate.

And where I can get help?    

Okay, I will try using less voxelshapes in the future and I did remove the stream#of and replaced it with VoxelShapes#or I also removed the return and reduce type at the end so the code wasn't necessary provided by BlockBench when I exported it as VoxelShapes, and it is maybe irrelevant but if I want make more custom blocks in the future it might include diagonal shapes too. Also, one question, how would I create a voxelshape for every possible rotation and change it via it's block state? Also thanks for all the help by the way, greatly appreciated.

public static final DeferredRegister<Item> VANILLA_ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, "minecraft"); public static final RegistryObject<Sugar> SUGAR = VANILLA_ITEMS.register("sugar", Sugar::new);   It doesent work with the minecraft id

Use ItemStackHandler instead of  IInventory https://forums.minecraftforge.net/topic/61757-common-issues-and-recommendations/?do=findComment&comment=289566